CHAPTER 5: SETTINGS
GROUPED ELEMENTS
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
5-253
5
There are three neutral overvoltage elements available. The neutral overvoltage element can be used to detect
asymmetrical system voltage condition due to a ground fault or to the loss of one or two phases of the source. The
element responds to the system neutral voltage (3V_0), calculated from the phase voltages. The nominal secondary
voltage of the phase voltage channels entered under
SETTINGS
SYSTEM SETUP
AC INPUTS
VOLTAGE BANK
PHASE
VT SECONDARY
is the p.u. base used when setting the pickup level.
The neutral overvoltage element can provide a time-delayed operating characteristic versus the applied voltage (initialized
from FlexCurves A, B, or C) or be used as a definite time element. The
NEUTRAL OV1 PICKUP DELAY
setting applies only if the
NEUTRAL OV1 CURVE
setting is “Definite time.” The source assigned to this element must be configured for a phase VT.
VT errors and normal voltage unbalance must be considered when setting this element. This function requires the VTs to
be wye-connected.
Figure 5-140: Neutral overvoltage1 logic
5.6.14.5 Negative sequence overvoltage (ANSI 59Q, IEC PTOV)
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
VOLTAGE ELEMENTS
NEG SEQ OV1(3)
There are three negative-sequence overvoltage elements available.
Use the negative-sequence overvoltage element to detect loss of one or two phases of the source, a reversed phase
sequence of voltage, or a non-symmetrical system voltage condition.
NEG SEQ OV1
NEG SEQ OV1
FUNCTION: Disabled
Range: Disabled, Enabled
NEG SEQ OV1 SIGNAL
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
NEG SEQ OV1 PICKUP:
0.300 pu
Range: 0.000 to 1.250 pu in steps of 0.001
NEG SEQ OV1 PICKUP
DELAY: 0.50 s
Range: 0.00 to 600.00 s in steps of 0.01
NEG SEQ OV1 RESET
DELAY: 0.50 s
Range: 0.00 to 600.00 s in steps of 0.01
NEG SEQ OV1 BLOCK:
Off
Range: FlexLogic operand
NEG SEQ OV1 TARGET:
Self-reset
Range: Self-reset, Latched, Disabled
NEG SEQ OV1 EVENTS:
Disabled
Range: Disabled, Enabled
827848A3.CDR
FLEXLOGIC OPERANDS
NEUTRAL OV1
FUNCTION:
NEUTRAL OV1 BLOCK:
NEUTRAL OV1 SIGNAL
SOURCE:
NEUTRAL OV1 PICKUP:
NEUTRAL OV1 DPO
NEUTRAL OV1 OP
NEUTRAL OV1 PKP
RUN
AND
SETTING
SETTING
NEUTRAL OV1 RESET
DELAY :
NEUTRAL OV1 PICKUP
DELAY :
SETTING
Enabled=1
t
PKP
t
RST
SETTING
SETTING
Off=0
ZERO SEQ VOLT (V_0)
3V_0 Pickup
<
NEUTRAL OV1 CURVE :
t
Содержание L60
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Страница 498: ...7 10 L60 LINE PHASE COMPARISON SYSTEM INSTRUCTION MANUAL TARGETS MENU CHAPTER 7 COMMANDS AND TARGETS 7 ...
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